Mr. Thomas Llewellyn Williams Profile

Thomas Llewellyn Williams

Project Manager at Sira Electro-Optics Ltd

SPIE Involvement:

Author

Proceedings Article | 26 February 2004 Paper

Wavefront sensing for testing spherical surfaces and lens systems: a new approach

Tom Williams, Alan Cormier

Proceedings Volume 5252, (2004) https://doi.org/10.1117/12.512823

KEYWORDS: Wavefronts, Wavefront sensors, Wavefront distortions, CCD cameras, Monochromatic aberrations, Spherical lenses, Adaptive optics, Phase shifts, Interferometers, Charge-coupled devices

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Proceedings Article | 7 January 2004 Paper

Flight experience of the Compact High-Resolution Imaging Spectrometer (CHRIS)

Mike Cutter, Lisa Johns, Dan Lobb, Tom Williams, J. Settle

Proceedings Volume 5159, (2004) https://doi.org/10.1117/12.505252

KEYWORDS: Calibration, Charge-coupled devices, Spectroscopy, Modulation transfer functions, Single crystal X-ray diffraction, Spatial resolution, Satellites, Telescopes, Bidirectional reflectance transmission function, Electronics

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Proceedings Article | 27 October 1999 Paper

Integration and testing of the compact high-resolution imaging spectrometer (CHRIS)

Michael Cutter, Daniel Lobb, Thomas Williams, Robert Renton

Proceedings Volume 3753, (1999) https://doi.org/10.1117/12.366281

KEYWORDS: Spectroscopy, Telescopes, Calibration, Charge-coupled devices, Mirrors, Modulation transfer functions, Sensors, Stray light, Spectral resolution, Spatial resolution

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Proceedings Article | 6 September 1999 Paper

Experimental measurements for passive athermalization of a satelliteborne MWIR telescope including dn/dT, CTE, and final evaluation

Thomas Williams, Daniel Lobb, Alan Cormier

Proceedings Volume 3739, (1999) https://doi.org/10.1117/12.360183

KEYWORDS: Telescopes, Image analysis, Silicon, Temperature metrology, Germanium, Prisms, Space telescopes, Mirrors, Modulation transfer functions, Mid-IR

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Proceedings Article | 11 August 1998 Paper

Comprehensive test facility for helmet-mounted displays

Thomas Williams, T. Wood, N. Bates, Alan Cormier

Proceedings Volume 3362, (1998) https://doi.org/10.1117/12.317452

KEYWORDS: Image analysis, Head-mounted displays, CCD cameras, Mirrors, Cameras, Eye, Optical filters, Modulation transfer functions, Collimators, Objectives

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Proceedings Article | 19 August 1996 Paper

Assessing the performance of binoculars and other visual afocal sights using a Strehl ratio criterion

Thomas Williams, Nigel Haig

Proceedings Volume 2775, (1996) https://doi.org/10.1117/12.246781

KEYWORDS: Modulation transfer functions, CCD cameras, Cameras, Visualization, Signal processing, Diffraction, Mirrors, Monochromatic aberrations, Spatial frequencies, Filtering (signal processing)

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Proceedings Article | 25 August 1995 Paper

Pupil-imaging wavefront gradient sensor

William Pugh, Daniel Lobb, David Walker, Thomas Williams

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217747

KEYWORDS: Sensors, Wavefronts, Wavefront sensors, Computer simulations, Point spread functions, Telescopes, Diffraction, Image sensors, Charge-coupled devices, Stars

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Proceedings Article | 1 January 1993 Paper

Measurement of the MTF of staring-array imaging systems

Thomas Williams

Proceedings Volume 1781, (1993) https://doi.org/10.1117/12.140987

KEYWORDS: Modulation transfer functions, Cameras, Imaging systems, Video, Fourier transforms, Staring arrays, Optical testing, Spatial frequencies, Oscilloscopes, CCD cameras

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Proceedings Article | 16 September 1992 Paper

Measurement of the MTF of IR staring-array imaging systems

Thomas Williams, N. Davidson

Proceedings Volume 1689, (1992) https://doi.org/10.1117/12.137978

KEYWORDS: Modulation transfer functions, Imaging systems, Video, Infrared imaging, Thermography, Cameras, Staring arrays, Fourier transforms, CCD cameras, Spatial frequencies

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Proceedings Article | 1 October 1990 Paper

Objective MRTD measurement: an update

Thomas Williams

Proceedings Volume 1320, (1990) https://doi.org/10.1117/12.22351

KEYWORDS: Modulation transfer functions, Imaging systems, Minimum resolvable temperature difference, Eye, Video, Thermography, Cameras, Spatial frequencies, Temperature metrology, Infrared technology

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Proceedings Article | 1 October 1990 Paper

Update on objective MRTD measurement

Thomas Williams

Proceedings Volume 1309, (1990) https://doi.org/10.1117/12.21786

KEYWORDS: Imaging systems, Minimum resolvable temperature difference, Modulation transfer functions, Video, Systems modeling, Spatial frequencies, Thermography, Cameras, Temperature metrology, Infrared imaging

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Proceedings Article | 1 October 1990 Paper

In-situ testing of FLIRs and other thermal imagers

Thomas Williams, B. Newton

Proceedings Volume 1320, (1990) https://doi.org/10.1117/12.22349

KEYWORDS: Collimators, Imaging systems, Control systems, Thermography, Infrared technology, Minimum resolvable temperature difference, Spatial frequencies, Forward looking infrared, Standards development, Mirrors

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Proceedings Article | 1 October 1990 Paper

Portable MRTD collimator system for fast in-situ testing of FLIRs and other thermal imagers

Thomas Williams

Proceedings Volume 1309, (1990) https://doi.org/10.1117/12.21787

KEYWORDS: Imaging systems, Collimators, Minimum resolvable temperature difference, Systems modeling, Control systems, Thermography, Spatial frequencies, Infrared imaging, Analytical research, Thermal modeling

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